首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
(1) A period of climate change about 130,000 years ago would have made water travel easier by lowering sea levels and creating n
(1) A period of climate change about 130,000 years ago would have made water travel easier by lowering sea levels and creating n
admin
2017-02-25
55
问题
(1) A period of climate change about 130,000 years ago would have made water travel easier by lowering sea levels and creating navigable lakes and rivers in the Arabian Peninsula, the study says. Such a shift would have offered early modern humans—which arose in Africa about 200,000 years ago—a new route through the formerly scorching northern deserts into the Middle East. The new paper was spurred by the discovery of several 120,000-year-old tools at a desert archaeological site in the United Arab Emirates. The presence of the tools—whose design is uniquely African, experts say—so early in the region suggests early humans marched out of Africa into the Arabian Peninsula directly from the Horn of Africa, roughly present-day Somalia. Previously, scientists had thought humans first left via the Nile Valley or the Far East.
(2) "Up till now we thought of cultural developments leading to the opportunity of people to move out of Africa," said study co-author Hans-Peter Uerpmann, a retired archaeobiologist at the University of Tubingen in Germany. "Now we see, I think, that it was the environment that was the key to this," Uerpmann said during a press briefing Wednesday.
(3) The discovery "leaves a lot of possibilities for human migrations, and keeping this in mind, might change our view completely." During the past few years, a series of tools were discovered at the Jebel Faya site in the U.A.E., some of which—such as hand axes—had a two-sided appearance previously seen only in early Africa.
(4) Scientists used luminescence dating to determine the age of sand grains buried with the stone tools. This technique measures naturally occurring radiation stored in the sand. For the climatic data, scientists studied the climate records of ancient lakes and rivers in cave stalagmites, as well as changes in the level of the Red Sea. This warmer period 130,000 years or so ago caused more rainfall on the Arabian Peninsula, turning it into a series of lush rivers that humans might have boated or rafted.
(5) During this period the southern Red Sea’s levels dropped, offering a "brief window of time" for humans to easily cross the sea—which was then as little as 2.5 miles wide, according to Adrian Parker, a physical geographer from Oxford Brookes University in the United Kingdom.
(6) Once humans entered the peninsula, they dispersed and likely reached the Jebel Faya site by about 125,000 years ago, according to the study, published in the journal Science.
(7) Geneticist Spencer Wells called the discovery a "very interesting find," especially because the Arabian Peninsula is becoming a hot spot for archaeological finds—particularly underwater, since the Persian Gulf was a fertile river delta during early human migrations. But he noted that the study doesn’t "rewrite the book on what we know about human migratory history." That’s because tools dating to the same period have already been found in Israel, so it’s "consistent with what we suspected" about an earlier wave of migration into the Middle East, said Wells, director of the National Geographic Society’s Geographic Project. Wells also noted there’s no evidence yet that the migrants in the new paper were our ancestors—the group, and their genes, may have died out long ago.
(8) Bence Viola, of the Max-Planck-Institute for Evolutionary Anthropology in Leipzig, Germany, agreed the finding was interesting but not that surprising, also citing the evidence of humans in Israel about 120,000 years ago. Viola, who wasn’t involved in the study, added that the migration route proposed in the paper makes sense on another level—the Arabian Peninsula would have been something early humans were used to. "If you look even today, the environment in the Horn of Africa, in Somalia or northern Ethiopia, is similar to what you see in Oman or Yemen—not like the big desert," Viola noted. "It’s not like they needed to adapt to a completely different environment—it’s an environment that they knew."
(9) Why they made the trek is another question, since they wouldn’t have been hurting for food or resources in their African homeland, Viola noted. "Curiosity," he said, "is a pretty human desire."
The scientists resorted to the following data sources in the research EXCEPT _____.
选项
A、radiation of the ancient lake water
B、radiation detected in the sand
C、the fluctuation of ocean levels
D、appearance of the stone tools
答案
A
解析
D项与第3段末句中石制工具的appearance相吻合,选项B、C分别在第,4段第2句和第3句中找到依据。本题为反选题.要求选出与文章不相符的一项,故选项A正确。
转载请注明原文地址:https://kaotiyun.com/show/vp7O777K
0
专业英语八级
相关试题推荐
Whatmakesthemurderofsixpeopleatthetemplecatchpeople’sattention?
ThefirstEnglishdictionarywaswrittenby______.
TheEnglishRenaissanceperiodwasanageof______
Thebizarreanticsofsleepwalkershavepuzzledpolice,perplexedscientists,andfascinatedwritersforcenturies.Thereisan
Becauseonceyouknowhowyouareandhowotherpeopleseeyou,youcanthengetintothedriver’sseat.
求学是一件艰苦的事情,许多人不能忍受那必经的艰苦,所以不能成功。
A、Howwealthyheorsheis.B、Whohasthepowerintherelationship.C、Whatyouareoffering.D、Whatmaygowrong.C本题设题点在原因解释处。
你得承认,多媒体不只是一件东西,而是包括许多东西的复杂的组合:硬件、软件和这两者相遇时的界面。不,我们还忘了一件很重要的事情。多媒体还包括你。是的,就是!对于多媒体,你不再是一个被动的观众,你可以控制,可以交互作用,可以让它按你的需要去做。这就意
A、Thedrivercanjudgedistance.B、Thedriverknowseverystreetwell.C、Thedriverkeepsknowledgeupdating.D、Thedriverlives
A、Sheownedacar.B、Shedrovewell.C、Shelikeddrivers’uniforms.D、Itwasherchildhooddream.D此题需要根据相关内容进行推理和归纳。女士说她从小就想学车,
随机试题
吗啡为麻醉药品,连续使用3~5日即产生耐受性,1周以上可致依赖性,仅用于疼痛原因明确的急性剧烈疼痛且短期使用或晚期癌性重度疼痛。下列关于吗啡表述中正确的有
合同法律关系由()等要素构成。
属于项目管理信息系统成本控制的功能的是()。
甲公司为增值税一般纳税人,委托外单位加工一批应交消费税的商品,以银行存款支付加工费200万元、增值税34万元、消费税30万元,该加工商品收回后将直接用于销售。甲公司支付上述相关款项时,应编制的会计分录是()。
某地有三家工厂,分别位于矩形ABCD的顶点A、B及CD的中点P处,已知AB=20km,AD=10km,为了处理三家工厂的污水,现要在矩形ABCD的区域上(含边界),且与A、B等距离的一点O处建造一个污水处理厂,并铺设排污管道AO,BO,OP,设排污管道的总
财政作为国家治理的基础和重要支柱,对促进科技创新具有重要的支撑、引领、提升与保障作用。具体来看,财政政策可以通过有的放矢的精准化财政投入,为科技创新输入供给端推力;通过有扶有控的差异化税收优惠通道,为科技创新构筑引导性激励;通过导向明确的选择性政府采购渠道
下列有歧义的句子是()。
物理意义上的物要成为法律关系客体,须具备的条件有()。
[*]=-cotxlnsinx+∫(csc2x一1)dx=一cotxlnsinx—cotx—x+C.
Interlocutor:Now,I’dlikeyoutotalkaboutsomethingforabout3minutes.I’mjustgoingtolisten.I’dlikeyoutodiscussab
最新回复
(
0
)